Answer:
1:3
Step-by-step explanation:
First, of all, keep in mind that you don't need the number of boys, because it is not in the question. Now we can look at the basic equation, which is "What is the ratio of counselors to girls." That would be Counselor: Girls. There are 10 counselors and 30 girls. Now we need to simplify the ratio. Much like simplifying a fraction, you need to simplify it with the same number. In this case, the best number to simplify with is 10, because it works with both numbers. 30 divided by 3 is 10. 10 divided by 10 is one. Now, lets put this in an easier way to understand:
Counselor = 1
Girls = 3
So, the ratio would be 1:3.
